Ok so I found the previous post on this problem marked as fixed. Now its up again.
Each time I get to second stage of alien base\artifact site, I get a seg. error and crash right after game saves.
This does not happen on liner missions. Also game crashes with seg. error when I try to pick up a stunned alien.
Using OXCE 6.3 + The world of terrifiying silence mod. Note: Game has same problems even without mod.
Dropping some saves and log.
Geosave is 1st day of month will spawn a art.site, also a base is to the left of it on other side of land. Save is with the TwOTS mod.